Efficient luminescence from a copper(i) complex doped in organic light-emitting diodes by suppressing C–H vibrational quenching

Wada, Atsushi; Zhang, Qisheng; Yasuda, Takuma; Takasu, Isao; Enomoto, Shotaro; Adachi, Chihaya

doi:10.1039/c2cc31509b

Cited by 95 publications

(47 citation statements)

References 30 publications

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“…In this framework, a sharp improvement of the Cu(I) based OLED performance was achieved by Wang"s group [109] with Cu(I) complexes containing DPEPhos, 2,9-di-n-butyl-1,10-phenanthroline (dnbp) as ancillary ligand and BF 4 -as counterion (112). Adachi and co-workers [114] rationally designed luminescent Cu(I) complexes with improved PLQY by suppressing not only the excited-state distortion but also C-H vibrational quenching. Heteroleptic complexes consist of DPEPhos bulky group and different aromatic N-heteroclyclic ligands (118).…”

Section: Oleds Fabricated By Solution Methodsmentioning

confidence: 97%

Cu(I) hybrid inorganic–organic materials with intriguing stimuli responsive and optoelectronic properties

Cariati

Lucenti

Botta

et al. 2016

Coordination Chemistry Reviews

366

264

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Section: Oleds Fabricated By Solution Methodsmentioning

confidence: 97%

Cu(I) hybrid inorganic–organic materials with intriguing stimuli responsive and optoelectronic properties

Cariati

Lucenti

Botta

et al. 2016

Coordination Chemistry Reviews

366

264

View full text Add to dashboard Cite

“…More recently, research focus has largely shifted to the mixed phosphine-diimine complexes [Cu(NN)(PP)] n+ (n = 0, 1) of neutral and cationic nature, for which an impressive enhancement of quantum yield was demonstrated reaching as high as 90%. 5,12,16,18,23,25,28 The emission observed originates mainly from MLCT excited states that makes possible tuning luminescence parameters through electronic and stereochemical properties of the ligands that stimulated further A general common feature of the Cu(I) complexes mentioned above is a conformationally rigid chelating bidentate phosphine that brings steric bulkiness and minimizes the undesired excited state distortions. It has to be noted that triphosphine ligands have been rarely used in the synthesis of Cu(I) species with only a few reports on luminescent compounds.…”

Section: Introductionmentioning

confidence: 99%

Alkynyl triphosphine copper complexes: synthesis and photophysical studies

et al. 2015

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“…[1,14] Consequently, great effort is put into establishing reliable solution-processing techniques for OLED manufacturing. [15][16][17][18] It needs to be highlighted that only some Cu(I) complexes are suitable for evaporation, [6,19] while many examples cannot be sublimated under standard conditions due to decomposition [20] or their ionic nature. [18] Amongst others, our group expressed doubt regarding the stability of Cu(I) complexes in solution and therefore the applicability of solution processing for copper compounds.…”

Section: The Chemistry Of Copper Complexesmentioning

confidence: 99%

X-ray absorption spectroscopy: towards more reliable models in material sciences

et al. 2015

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The creation of molecular models and the finding and understanding of structure-property relationships are the most crucial steps when developing new materials. While many great findings and inventions in the history of science and technology strongly relied on a certain degree of randomness, it becomes vital at a certain stage of development to really understand why a certain material has beneficial properties in order to create better and better materials. In in the development of organometallic light-emitting materials, scientists often use structural models based on crystallography, e.g. data obtained by the investigation of single crystal samples. Based on these models, further analyses, and comparison to known substances or so-called "chemical intuition" then leads to the proposition of modified, nextgeneration materials, which may or may not be realized by chemical synthesis.While this approach has been executed with great success in the past, problems arise in cases where the initial model is too simple, inaccurate or even false. In this article, we propose an alternate approach to prevent such problems: the use of X-ray absorption spectroscopy (XAS), a long-known technique, in material science. In several case studies, we highlight problematic examples from the past and show where and how XAS was and could be used to prevent erroneous models. SCOPE AND INTRODUCTIONUsing copper(I) emitters in organic light-emitting diodes (OLEDs) offers the possibility to fabricate highly efficient, light-emitting devices with abundant materials.[1,2] With the most recent breakthroughs, copper emitters emitting via a thermally-activated delayed fluorescence (TADF) mechanism [3,4] are now on par with the most efficient state-of-the-art phosphorescent iridium emitters. [5][6][7] However, it has been becoming increasingly apparent that the chemical differences between copper and iridium compounds require special care regarding the determination of the molecular structure. As a standard procedure, many laboratories rely on single crystal X-ray diffraction to determine the structure of copper or iridium-containing molecules. Based on those structures, further considerations are made, e.g. by calculation of the electronic properties via quantum chemical methods. If the local distribution of the frontier orbitals HOMO and LUMO are known, the modification of the molecular structure and therefore the spectral properties is straight-forward.This approach, which has been successfully followed by many chemists, has one distinct flaw: it relies heavily on the applicability of the structures derived from single crystal X-ray scattering to amorphous films. In this article, we intend to highlight cases where this model failed and intend to offer an alternate approach: X-ray absorption spectroscopy. This method is especially suited for all samples containing metal ions and can be used for various sample forms and -most importantly-suited for amorphous solid state samples and even solutions.

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Efficient luminescence from a copper(i) complex doped in organic light-emitting diodes by suppressing C–H vibrational quenching

Abstract: Efficient luminescence was realized by suppressing not only excited-state distortion but also C-H vibrational quenching in a Cu complex. Organic light-emitting diodes containing the Cu complex as an emitting dopant exhibited a maximum external quantum efficiency of 7.4%.

Cited by 95 publications

References 30 publications

Cu(I) hybrid inorganic–organic materials with intriguing stimuli responsive and optoelectronic properties

Cu(I) hybrid inorganic–organic materials with intriguing stimuli responsive and optoelectronic properties

Alkynyl triphosphine copper complexes: synthesis and photophysical studies

X-ray absorption spectroscopy: towards more reliable models in material sciences

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